Screen Dimensions from Diagonal

Turn a screen diagonal into the width and height that decide whether it fits.

What you provide

The number the display is sold by — 27", 34", 55".

16:9 for most monitors and TVs, 21:9 or 32:9 for ultrawides, 16:10 for many laptops, 4:3 for older panels.

Result

23.5 × 13.2 in

A 27-inch 16:9 panel measures 23.5 by 13.2 inches of active area — 59.8 cm by 33.6 cm. Add bezel and a stand before comparing that against the space you have.

Diagnostic telemetry
Panel width59.8 cm
23.5 in
Panel height33.6 cm
13.2 in
Viewable area2010 cm²
312 in²
Aspect ratio
16:9

What this cannot tell you

  • Gives the active panel area only. The monitor itself is larger — bezels add roughly a quarter to half an inch per side on a modern display, and the stand adds depth and height beyond that. Measure the chassis, not this, before committing to a shelf or a desk cutout.
  • Assumes the advertised diagonal is exact. Manufacturers round: a panel sold as 27 inches is often 27.0 in one range and 26.9 in another, and televisions are frequently rounded to the nearest inch.
  • Says nothing about whether the picture is good. Size, panel type, refresh rate and colour accuracy are independent of each other.

Take this with you

Screen Dimensions from Diagonal on RunTheTests — free browser-based device tools, no sign-up.